JPH0949612A - Air dispersing pipe for fluidizing air - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air dispersing pipe for fluidizing air, which is capable of unifying the outlet temperature of fluidizing air. SOLUTION: This air dispersing pipe for fluidizing air is provided with an outer cylinder 9, whose inlet port side is opened and whose outlet port side is shielded while discharging holes 5 are formed across the whole area in the lengthwise direction of an outer peripheral part, and an inner cylinder 10, retained so as to be fitted loosely into the outer cylinder 9, whose end, opposed to the inlet port side of the outer cylinder 9, is shielded, whose end, opposed to the outlet port side of the outer cylinder 9, is opened and whose small holes 13 are formed across the whole area in the lengthwise direction of the outer peripheral part thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air diffuser for fluidized air for fluidizing a fluid medium in a fluidized bed refuse incinerator.

[0002]

2. Description of the Related Art Conventionally, in a fluidized bed type refuse incinerator, in order to form a fluidized bed, high temperature fluidized air is supplied to an air diffuser and discharged from a discharge hole to activate a fluidized medium to activate the fluidized bed. Had formed.

FIG. 5 is a configuration diagram of an air diffuser according to a conventional example. FIG. 5 (a) is a side view and FIG. 5 (b) is a partially sectional front view.

In the air diffuser 4, flowing air is supplied from the air diffuser inlet 7 of the outer cylinder 12. This air is discharged to the outside of the pipe from the discharge hole 5 formed in the outer cylinder 12, because the closing flange 8 is provided on the outlet side of the air diffusing pipe and is shielded.

[0005]

In the above-mentioned prior art, in the fluidized bed type refuse incinerator, the air diffuser is used as the equipment for forming the fluidized bed, but normally the fluidized air at 250 to 300 ° C. is supplied. On the other hand, since the temperature of the fluid medium surrounding the diffuser pipe is as high as 700 to 800 ° C, heat exchange is performed through the outer wall of the diffuser pipe, and the temperature of the blown flowing air is low on the front side of the diffuser pipe and high on the back side. Therefore, there are the following problems.

(1) In forming a fluidized bed, if the discharge holes have the same diameter, the higher the temperature of the fluidized air, the faster the blowing rate and the activated fluidized bed. If there is a temperature difference between the two, a uniform fluidized bed cannot be formed.

(2) When flowing air of 250 to 300 ° C. is supplied to the air diffuser, heat is exchanged in the air diffuser as it goes deeper and the blowout temperature becomes higher, so that the outer wall of the air diffuser also becomes hot. Corrosion is likely to occur and the life of the air diffuser is shortened.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a diffuser tube for fluidized air which can make the blowing temperature of the fluidized air uniform.

[0009]

In order to achieve the above object, the first means is to open an inlet side and shield an outlet side, and to form a discharge hole over the entire length of the outer peripheral portion in the longitudinal direction. Then, in the air diffuser for fluidized air that performs heat exchange between the fluidized air supplied from the inlet and an external fluidized medium having a temperature higher than that of the fluidized air, and discharges the fluidized air having a high temperature from the discharge hole, Open the entrance side and shield the exit side,
Moreover, the outer cylinder having discharge holes formed in the entire length of the outer peripheral portion in the longitudinal direction, and the outer cylinder held so as to be loosely fitted to the outer cylinder, and the end portion facing the inlet side of the outer cylinder is shielded, and An inner cylinder having an opening at an end facing the outlet side of the outer cylinder and further having a small hole formed over the entire length of the outer circumference in the longitudinal direction is characterized.

The second means is such that the inlet side is opened and the outlet side is shielded, and the discharge hole is formed over the entire area of the outer peripheral portion in the longitudinal direction, and the flowing air supplied from the inlet and the flowing air. In a diffuser tube for fluidized air that discharges hot fluidized air from a discharge hole by exchanging heat with an external fluid medium having a temperature higher than that of air, a portion facing the discharge hole is opened on the outer peripheral portion. The feature is that a refractory material is provided.

[0011]

In the first means, heat is exchanged between the retained heat of the fluid medium and the flowing air flowing between the outer tube and the inner tube of the diffuser pipe through the wall of the diffuser pipe outer cylinder, and then the flowing air. To the inner tube of the air diffuser. Therefore, the temperature difference between the outer tube of the air diffusing tube and the inner tube of the air diffusing tube is small, the amount of heat exchange in the inner tube of the air diffusing tube is also small, and the temperature of blowing the flowing air is high. As a result, the blowing temperature becomes uniform and a stable fluidized bed can be formed.

Further, since the blowing temperature gradient on the front side and the back side of the air diffuser is small, the local low temperature region and high temperature region of the fluidized medium are reduced, and the incineration conditions can be made uniform.

Further, since the temperature of the blowing air of the flowing air can be made uniform at a high temperature by exchanging heat in the diffusing tube, the temperature of the flowing air supplied to the diffusing tube can be lowered as compared with the conventional temperature. As a result, the temperature of the outer wall of the air diffuser can be lowered, and the problem of short life due to high temperature corrosion can be solved.

In the second means, by providing a refractory material in the air diffuser, the amount of heat exchange is reduced and the temperature of the flowing air becomes uniform, so that the same effect as above can be obtained.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a fluidized bed type refuse incineration facility to which the present invention is applied.

In the system shown in FIG. 1, the air is discharged from the fluid blower 1, the temperature of the fluid air is raised to about 250 to 300 ° C. by the air preheater 2, and the hot air is supplied to the air diffuser header 3. I am supposed to do it.

Then, high temperature air is discharged from the discharge holes 5 to the fluid medium 6 through each air diffuser 4 to form a fluidized bed.

FIG. 2 is a configuration diagram of an air diffusing tube according to the first embodiment, FIG. 2 (a) is a side view, and FIG. 2 (b) is a partially longitudinal front view.

The air diffuser 4 according to the first embodiment shown in FIG.
Is opened on the inlet side and is closed on the outlet side by the closing flange 8, and the discharge hole 5 is formed over the entire area in the longitudinal direction of the outer peripheral portion.
And an outer cylinder 9 formed with the outer cylinder 9, the end of the outer cylinder 9 facing the inlet side is shielded by the closing flange 11, and the outlet of the outer cylinder 9 is retained. The inner cylinder 10 is provided with an opening at an end facing the side and further having a small hole 13 formed over the entire area of the outer peripheral portion in the longitudinal direction.

In such a structure, when the flowing air is supplied from the inlet 7, while the air passes between the outer cylinder 9 and the inner cylinder 10, it is passed through the outer cylinder wall by the heat retained by the fluid medium 6. Heat exchange takes place.

Since the closing flange 8 is provided on the air diffuser outlet side, the flowing air is supplied to the inside of the inner cylinder 10. However, since the closing flange 11 is also provided on the inner cylinder outlet side, the flowing air is It flows from the small hole 13 into the gap between the inner cylinder 10 and the outer cylinder 9, and is further discharged from the discharge hole 5 to the outside of the pipe.

At this time, the flowing air supplied into the inner cylinder 10 has a small temperature difference between the outer cylinder 9 and the inner cylinder 10 and inside the inner cylinder 10, so that heat exchange is not performed and the flowing air is blown out. The temperature becomes uniform at a high temperature, and the blowing speed of the gas discharged to the fluid medium 6 through the discharge holes 5 becomes uniform, so that a stable fluidized bed can be formed.

Further, since the blowing temperatures on the inlet side and the inner side of the air diffuser 4 are high in temperature, the temperature gradient is reduced,
The local low temperature region and high temperature region of the fluidized medium 6 are reduced, and the incineration conditions can be made uniform.

Considering that heat is exchanged between the outer cylinder 9 and the inner cylinder 10 through the outer wall of the air diffusing pipe by the retained heat of the fluidized medium 6, as shown in FIG. The temperature of the flowing air is set to 320 ° C. or lower because it tends to occur rapidly from 0 ° C.

Therefore, the flowing air supplied to the inlet 7 can be cooled to a temperature lower than the conventional temperature, so that the outer wall of the air diffuser tube is not corroded at high temperature, and the life of the air diffuser tube 4 is extended.

Here, if the material of the inner cylinder 10 is made of a heat-resistant and heat-insulating material (such as ceramic), the blowing temperature becomes even higher and a stable fluidized bed can be formed.

FIG. 4 is a configuration diagram of the air diffusing tube 4 according to the second embodiment. FIG. 4 (a) is a side view and FIG. 4 (b) is a partially longitudinal front view.

The air diffuser 4 according to the second embodiment shown in FIG.
Is a single cylinder of the outer cylinder 9, and the refractory 1
4 is provided. An opening is formed in the refractory material 14 at a position facing the discharge hole 5 formed in the outer cylinder 9 so that the discharge of the flowing air may be prevented.

By providing the refractory material 14 in this way, the amount of heat exchange is reduced and the temperature of the flowing air can be made uniform, so that the same effect as in the first embodiment can be obtained.

[0031]

According to the first aspect of the present invention, the structure of the air diffusing tube is a double tube structure, and the flowing medium and the flowing air are heat-exchanged through the outer tube wall of the air diffusing tube and flow into the inner tube of the air diffusing tube. As a result, the temperature of the fluidized air becomes high in temperature, so that the blowing temperature of the air diffuser becomes constant, and the fluidized state of the fluidized bed can be stabilized.

Further, since the blowing temperature gradient on the front side and the back side of the air diffuser is small, the local low temperature region and high temperature region of the fluidized medium are reduced, and the incineration conditions can be made uniform. Furthermore, by lowering the temperature of the flowing air supplied to the diffuser pipe, high temperature corrosion is less likely to occur in the diffuser pipe,
The life of the air diffuser can be extended.

According to the second aspect of the present invention, the refractory material can reduce the heat exchange amount and make the temperature of the flowing air uniform, so that the same effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a fluidized bed waste incineration facility to which the present invention is applied.

FIG. 2 is a configuration diagram of an air diffusing tube according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a tube wall temperature and a corrosion rate.

FIG. 4 is a configuration diagram of an air diffusing tube according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an air diffuser according to a conventional example.

[Explanation of symbols]

 5 Discharge hole 9 Outer cylinder 10 Inner cylinder 13 Small hole 14 Refractory material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Mochizuki 6-9 Takara-cho, Kure City, Hiroshima Prefecture Bab Kotsk Hitachi Co., Ltd. Kure Factory (72) Inventor Hideharu Mori 1-2-10 Isogo, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Babkotsu Hitachi Co., Ltd. Yokohama Engineering Center

Claims (2)

[Claims] 1. A fluidized air supplied from an inlet, and an exterior having a temperature higher than that of the fluidized air, wherein the inlet side is opened and the outlet side is shielded, and a discharge hole is formed over the entire area of the outer peripheral portion in the longitudinal direction. In the diffuser pipe for fluidized air that exchanges heat with the fluidized medium of the above, and discharges the heated fluidized air from the discharge hole, the inlet side is opened and the outlet side is shielded, and the length of the outer peripheral portion is long. An outer cylinder having discharge holes formed over the entire direction, and an outer cylinder that is held so as to be loosely fitted to the outer cylinder, has its end facing the inlet side of the outer cylinder shielded, and has an outlet side of the outer cylinder. An air diffuser for fluidized air, comprising: an inner cylinder having an end portion facing the opening and an inner cylinder having a small hole formed in the entire outer peripheral portion in the longitudinal direction. 2. A flow air supplied from the inlet and an outside having a temperature higher than that of the flow air, the inlet side being opened and the outlet side being shielded, and the discharge hole being formed over the entire area in the longitudinal direction of the outer peripheral portion. In the air diffuser for fluidized air that exchanges heat with the fluidized medium of the above, and discharges the heated fluidized air from the discharge hole, a refractory material with an opening facing the discharge hole is provided on the outer periphery. An air diffuser for fluidized air.